What in your opinion are the best and worst ending to a Clamp series (anime or manga)?

Best ending was hard to choose because quite a few have happy endings...But for the best, Cardcaptor Sakurawins.

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Syaoran and Sakura end up together for forever, as do Toya and Yukito, Eriol and Kaho (and all of Sakura's school friends who were in a relationship). Tomoyo's the only one left out as the unlucky lesbian best friend (OHCLAMP) but she's happy because Sakura's happy so I guess it's...okay?

Worst ending isdefinitelyTokyo Babylon

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Seishirou murders Subaru's twin sister Hokuto. Not only is this horrifically terrible, but Subaru was going to confess to Seishirou his feelings for him, not knowing that Seishirou was actually planning to kill Subaru because of a bet he apparently thinks he's "won". So Seishirou pretty much f*cks up Subaru's life for all time. And in the follow up manga X/1999 where their story continues, Subaru's still screwed up and all tragic and angsty. I'm not even going into what happens in that story with Sei and him. Holy shit volume 16.

At least they might get a chance of happiness in Tsubasa. Or not.

And I guess all their uncompleted series have pretty bad "endings". *Sigh* Wish they would finish X/1999damn it. And I want to see some more of Clover!